1# SPDX-License-Identifier: GPL-2.0 2 3config TRACE_IRQFLAGS_SUPPORT 4 def_bool y 5 6config SH_STANDARD_BIOS 7 bool "Use LinuxSH standard BIOS" 8 depends on SUPERH32 9 help 10 Say Y here if your target has the gdb-sh-stub 11 package from www.m17n.org (or any conforming standard LinuxSH BIOS) 12 in FLASH or EPROM. The kernel will use standard BIOS calls during 13 boot for various housekeeping tasks (including calls to read and 14 write characters to a system console, get a MAC address from an 15 on-board Ethernet interface, and shut down the hardware). Note this 16 does not work with machines with an existing operating system in 17 mask ROM and no flash (WindowsCE machines fall in this category). 18 If unsure, say N. 19 20config STACK_DEBUG 21 bool "Check for stack overflows" 22 depends on DEBUG_KERNEL && SUPERH32 23 help 24 This option will cause messages to be printed if free stack space 25 drops below a certain limit. Saying Y here will add overhead to 26 every function call and will therefore incur a major 27 performance hit. Most users should say N. 28 29config 4KSTACKS 30 bool "Use 4Kb for kernel stacks instead of 8Kb" 31 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 32 help 33 If you say Y here the kernel will use a 4Kb stacksize for the 34 kernel stack attached to each process/thread. This facilitates 35 running more threads on a system and also reduces the pressure 36 on the VM subsystem for higher order allocations. This option 37 will also use IRQ stacks to compensate for the reduced stackspace. 38 39config IRQSTACKS 40 bool "Use separate kernel stacks when processing interrupts" 41 depends on DEBUG_KERNEL && SUPERH32 && BROKEN 42 help 43 If you say Y here the kernel will use separate kernel stacks 44 for handling hard and soft interrupts. This can help avoid 45 overflowing the process kernel stacks. 46 47config DUMP_CODE 48 bool "Show disassembly of nearby code in register dumps" 49 depends on DEBUG_KERNEL && SUPERH32 50 default y if DEBUG_BUGVERBOSE 51 default n 52 help 53 This prints out a code trace of the instructions leading up to 54 the faulting instruction as a debugging aid. As this does grow 55 the kernel in size a bit, most users will want to say N here. 56 57 Those looking for more verbose debugging output should say Y. 58 59config DWARF_UNWINDER 60 bool "Enable the DWARF unwinder for stacktraces" 61 select FRAME_POINTER 62 depends on SUPERH32 63 default n 64 help 65 Enabling this option will make stacktraces more accurate, at 66 the cost of an increase in overall kernel size. 67 68config SH_NO_BSS_INIT 69 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 70 depends on DEBUG_KERNEL 71 default n 72 help 73 If running in painfully slow environments, such as an RTL 74 simulation or from remote memory via SHdebug, where the memory 75 can already be guaranteed to ber zeroed on boot, say Y. 76 77 For all other cases, say N. If this option seems perplexing, or 78 you aren't sure, say N. 79 80config SH64_SR_WATCH 81 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 82 depends on SUPERH64 83 84config MCOUNT 85 def_bool y 86 depends on SUPERH32 87 depends on STACK_DEBUG || FUNCTION_TRACER 88